SPZ Section Aluminium Pulley Un-Bored: Powerdrive aluminium pulleys are used with v-belts, they are designed with a drill-able centre, pre-marked with a centre point enabling the user to create a precise custom bore to suit individual needs. Manufactured from high quality aluminium, Powerdrive pulleys are lightweight while being hard-wearing and incredibly reliable. Powerdrive aluminium pulleys are perfectly suited for applications such as air compressors generators or printing machinery.Benefits: Powerdrive aluminium pulleys are available with pitch circle diameters (PCD) ranging from 50mm - 300mm and are made using 356.1 aluminium alloy.